/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package action;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Benny
 */
@WebServlet(name = "LifeServlet", urlPatterns = {"/LifeServlet" ,"/java/*",})
public class LifeServlet extends HttpServlet {
    int count=0;
    String path="";
    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
            /* TODO output your page here. You may use following sample code. */
            
            out.println("造訪人數：" + ++count + "人<br>");
            
        
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    @Override
    public void init() throws ServletException {
        super.init();//To change body of generated methods, choose Tools | Templates.
        System.out.println("我要印出INIT....");
        ServletContext sc=this.getServletContext();
        path=sc.getRealPath("/count.txt");
        System.out.println(path);
        java.io.File file=new java.io.File(path);
        System.out.println(file.exists());
        if(file.exists()){
            try(java.io.FileInputStream fin=new java.io.FileInputStream(file);
                java.io.DataInputStream din=new java.io.DataInputStream(fin)){
            count = din.readInt();
            }catch(Exception e){
                e.printStackTrace();
            }      
        }
    }
    
    @Override
    public void destroy() {
        super.destroy(); //To change body of generated methods, choose Tools | Templates.
        System.out.println("我要印出DESTROY....");
        try(java.io.FileOutputStream fout=new java.io.FileOutputStream(path);
            java.io.DataOutputStream dout=new java.io.DataOutputStream(fout);){
        dout.writeInt(count);
        }catch(Exception e){
            e.printStackTrace();
        }
    }

}
